Abstract
Bark constitutes a significant portion of total tree biomass. Its removal from tree stems and whole tree chips requires special equipment and increases energy consumption in chemomechanical pretreatments needed for efficient enzymatic hydrolysis of cellulose to sugars. Since the utilization of bark for biological conversion could also increase the supply of sugar from tree biomass over that available from wood alone, we have undertaken a preliminary investigation of dilute acid pretreatment for four barks from hardwood trees. The results indicate that bark from three poplar trees (aspen and two poplar hybrids) is susceptible to dilute acid pretreatment. However, the bark from sweetgum ( Liquidambar styraciflua) was unresponsive and high levels of enzymatic digestibility of cellulose were not observed either before or after pretreatment of this bark.
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